Water jug



FIG. 1 is a perspective view of a water jug;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a left elevation view thereof, the right elevation view being a mirror image thereof;

FIG. 4 is a rear elevation view of FIG. 1; and,

FIG. 5 is a top plan view of FIG. 1; the bottom plan view being a mirror image thereof.

The broken lines shown in the drawings depict portions of the water jug that form no part of the claimed design. 

CLAIM The ornamental design for a water jug, as shown and described. 